Reliever Felix Pena is known these days as the player the Cubs sent to Triple-A Iowa to make room for Ian Happ.

But manager Joe Maddon sees a promising future for Pena, who allowed two earned runs in five innings in his brief stint with the Cubs this month.

"I'm a big Felix Pena fan," Maddon said Saturday. "I think he's going to be very good. He understood why we had to do this.

"Beyond having good stuff, he has a calm about him when he pitches, which will benefit him as he gains more experience. It's a combination of good mound presence with good mound stuff."

Pena, 27, returned to Iowa, where he earned a promotion on the basis of a 1.86 ERA and 11 strikeouts in 9 2/3 innings. If Pena can limit walks (six), he could return to the Cubs in the near future.

Eloy Jimenez, OF, Class A Myrtle Beach: The organization's top prospect returned after being sidelined for nearly two months by a right shoulder bruise and went 5-for-11 in his first three games, including a game-ending bases-loaded walk in the 13th Sunday and his first home run Monday night.

Victor Caratini, C, Iowa: The switch hitter is creating a nice problem with Willson Contreras and Kyle Schwarber ahead of him. Caratini is 13 for his last 29 with two homers and has raised his average from .315 to .347.

Ian Rice, C, Double-A Tennessee: The 29th-round pick in 2015 out of the University of Houston was attractive because of his high on-base percentage. In addition to a .425 on-base percentage, Rice hit four home runs during a nine-game span.

Gerardo Concepcion, LHP, Tennessee: After signing with the Cubs for $6 million out of Cuba in 2012, Concepcion was released last week after posting a 5.87 ERA in seven appearances.

Oscar De La Cruz, RHP, Class A Myrtle Beach: He pitched a five-hit shutout Sunday against Lynchburg despite striking out only one. De La Cruz has allowed one earned run in his last 13 innings.